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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2723e43a8f81af4cfc9bf2774bebead098f33a408b37e5dd01ddbaf71857bbe5' 
  AND token = '3Iv89Jq2YfoyfoIzJWM9rg3+UR4ZqheZIsGxHf9F6uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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