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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55ec31de769cf31909e9bf5841c21f21eaeb4ff6ec58f7c13d6743c41ea1733' 
  AND token = '5okRlwjS8FKKo9Zs3mz7kSGbaAu6lIitJmMinh5awgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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