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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9fdadddc255f552124790d8f1aabd392fa143d5465c14c72b6deb90a9096f0' 
  AND token = 'NVvlzueDa7LfozCzCWOKkgz4y6PsrdJ2n9UMx84LaIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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