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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4900d2f5f0ff579fd2079f77c416b5dabb4029ee9f5ad7cb79f6ac6b17ac39dc' 
  AND token = 'xOOLnFt0E9D8ixrO0dN+f9EhOvo8gcxKL7MqzzJY0pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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