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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a89804d26894968da7ba0127496d58a53baba1325a8217570279e81bc193f44' 
  AND token = 'e9UGz7IDEWJhxF/r2I2ET+WJPpZIiLQAb7VBk8YsTM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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