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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3ba90f7bf79937cc75fffee1ebf7f3254a6c1a5aaa65d08b6169993b6de0d0' 
  AND token = 'YAiLoqsneVqLtE2KYCx2y/nMHbqzbIknMK/xy937zp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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