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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506a2ed0e45a99e624b1b01e80d0f91ac476f50ee04bf35b147b1f109602822f' 
  AND token = 's+O0YJLoEubiQqGnAKyLaTK7LSTzJPTGFuMI8NQJ98c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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