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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460f1820e7956090fbf4db1c9fab6d55b007842fc92f016c91ec0708e27a6d72' 
  AND token = '7dAMPz6TgQaW/MA4mKqerfqcDi8E5CPGLyecsU+/Mk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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