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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766693d12435ece2b682ebc58a75d6134446c973608cfcc5ea24a4463c6be184' 
  AND token = 'hECtvrQFvDLaSZ4fqOMRiAERgNb8ErbCmDYYk30hRvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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