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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d03a4659c36db6c0bd13387e40012e5bb0a7e8cb6298a356c25ab5810788f85' 
  AND token = 'jCMAbt6oL8WSx7I0/UnLAwwD9VjaQHE4qzf7pgLKUHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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