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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e27dd9aaef7c77c0eb8e933a34fc2f6a9bdd44880f6b9c889831a7a2c8e9460' 
  AND token = 'OylpBK11GWTal5q27wK+H0pUIIuEPf/zxHXAUPclRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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