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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8d00ac6d8228646af0ae547acd03f1dcd664c437fc217c8630a124fac27a61' 
  AND token = '0S5freS1aeTNdxemVvTHgJsDC4zq/oTT5NZHy25rmcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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