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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9043958f84f77e96a15cc5a3bc8eb83efe9362b383c83a09a2b047c0ac155c0' 
  AND token = 'SpiB2FZnBtBnI4Itcc6Gh2faLY/kap+g2LDZEyuXvwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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