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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3aff11dcc2d8734b7608b7839b5a5a8ad5bc7c9b160623f9384701a52d8e17' 
  AND token = 'JCiGa13UWRSi2D4lCpUu0J0JCZrU6JpCP5X4/rZkDxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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