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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6889bbc2dc436d3311c2c45a00e7db105672823249be5189ccebe57f36700508' 
  AND token = 'WVc5gDIwdN5Z5XUbj9H553TDFsv81NXQO0sp8Eub6Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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