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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57032ddb978fcc242b5361ac3f3164011c184ca6a094df698ec7e61ddfcbd0f3' 
  AND token = 'ws1kzkDrru3Upm2nN34E+8mrDQWGftIQJwfAdDARZeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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