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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7e6826a675486cfa2b22a62fa2e9593b0ba847a9d5a94094feeeae2c6a914c' 
  AND token = 'Ywi24LUG7jpNgzSCHMFgV4QrfkPA3hh8Xtj/h4iy5VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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