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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16a7167b4b27f7caa248a8c054a80d78f8e6421bf4979bac7ae06978dd5b1ff' 
  AND token = 'I24YR7JaH3xk6wFJI1i71UKYtw1/dBPbORqu7Gu8nDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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