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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5896c394e3c189e2f0f2b473e7c78d58717d09efdab01e964641e8db3dfc51ef' 
  AND token = 'oL2Fd5oVqZ+C2o1D9n0kTf7n2UNtyBnphpFoiFrF6V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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