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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95e1e9c6d9c1f74987b53250d5dcd1916d7402216d2c886599eed75cc74ef98' 
  AND token = 'iMG8uyLN9bp5W8upPy7B9/b2Ta+0nQV/7hGnD4HZHag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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