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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98590791dad0f0b403a778c63b99de552a9a57965902ae677ab032f5922f67d8' 
  AND token = 'ewXGSMqNF727Dbqa7ibChis3Qwqf2J8J/VE7VvD7hCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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