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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f28ae984b33b716d88d2e685ddca148e529d0eca3b4654e24e53a7746c15a' 
  AND token = 'DmEZ1v+PxnVyatEZwrptiHSNAGnycDUyGUOEerkYmjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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