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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb2fd77caa916e55857b82910071e6ca753a15ce1a25aaff7dfe85fb51fae4d' 
  AND token = 'an4B1gxC1zRexZ6H4o4GUsMmb5KhnjfhSiC6N6lfYyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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