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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5484724ad128e648758a3f703f65800e50810cfdedd7c7936aa7697d236c2f63' 
  AND token = 'OUT1HYkcFEA6tU1eNOPEjbJxmnRL5QGBNrHOA0GT15Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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