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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce9596f4f241f5e8609ec1956797f26b555c7e8f8538b73f074f7e485c0615c' 
  AND token = 'M25UCy0z2LTmIS5bWFB9v89y5iwe8CWeyiHosVuex4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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