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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5088de4d243915750ba935e0892752cb24088c6b6194b1eeeef5216b8a964ec9' 
  AND token = 'kiQdMylj2Y9QuD/2qkOB0fl7nfUQm7xtIa0prPzKOCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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