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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e26ba44b670771c0176a23afb7d68043299dcd54b08e236b37a22cb8ed6dc6' 
  AND token = 'jernuhjv9Z0TXAxtcIA+y9M+cHNqro/w0Nhqc/gY8F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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