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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5508ecff3380471eb8d9ba14d136110274a98aca71b3d8cd8a955d1b2b25dd39' 
  AND token = 'Kn7A3VtRcRSWOLfRyV3kjWoS3OIaRsQQTAnMzDoxuc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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