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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9ad64ab589cc21f59d51d9a77c29747cbf366f35466f130ae34822e2089e7f' 
  AND token = 'kKnjb0jhll52/t30Oj8smrQid0HDjPf/1Eee+paQwqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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