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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2957df9feeeabb9733798d0f72cdac07b82a1ece105eabdd2c7952c40d2d47' 
  AND token = '0EB1K9MBSjgr2S0TDJcFZxhSx9qRPGXskI8Jh06zc+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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