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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afd4744e91af505e08a239c255999181903f5ab54c833c8c83285d92e10cbfb' 
  AND token = 'EQ+0r+j+hJc72yDEgLNj7H2eVXd5+T4ZYKztC1793wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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