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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e68d34377d4f0857852035ed9a4cf05330bbcba03233690cf23296ba39d0134' 
  AND token = '2sbTp3T1c/8D+XV3RLBkRyRvoZouyJHpQAQFwh5wuRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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