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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ebf432e0598273e7c3c3cfbdd8a5e5fa02e7cf49a38ce25fd7eb192221eb67' 
  AND token = 'wH/DG0Sn84LJMHyKqIe72ZmrMGjDZX4zeyZHXaSyh0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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