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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a01ad5c4e9a59a34c9f0d8e1453c747865e7fc89d9240a4eab3318839cd8f1' 
  AND token = 'rDss8KDAx8EpYJoj80fpMJ3fJnrbD8WCL/Yanqe87BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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