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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4090607e3be3d981cba424c8a80a4778fa98e11057f9e83cc2af029ed9b62500' 
  AND token = 'nLjr4duk0NgAyPmIoVR2n1L6KXrDqGii7xIDKsMalhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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