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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd4132688871b2174b189bfa26218d14334a8b1616cd87cf45d7277884c046b' 
  AND token = 'Jegq53iR20lsVaNlOv//2cuqhUuEVCNeQp+7cgsuhvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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