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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dba4abf89e615f49a87bee5fd26f4487297abf6a5ef1d245c3dbe806be7e8b' 
  AND token = 'xZLTXKebVAKd2S3GH0nT3nodVzgDPUEC1qs4Ja05DIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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