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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0a9e67b4d65034b22872d54e6ebcb2e75fea96f220f83d5b56ea71bb73a08b' 
  AND token = 'u9SHrV1uAGt0z7mX2aOGExxix/ncpk/Ut4wy1diL6DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}