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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da989016968899191e016901771fe5694bf4a7b68b1859c208fc5997e8e5337e' 
  AND token = 'MhO9QfXEkr0cMIvszTOIZ1d3eXR21K6cY4ti/V1KUFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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