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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d663ca766cb9e35e804669265d6852f089e394b37d5682ca58a7b4c9a965925' 
  AND token = 'GG8Ymki78vM0yPm362Y3gGo6t8OujOsI0QUCiZv3hO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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