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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8478ee509c90ed3fb0cf3d124ca41a9c555e1a006b3405e82bbafdd47dab9530' 
  AND token = 'Fdmuw9+fyTWYA4yyFuGpWyTLJWo377X3ZDhuRPpmgv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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