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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcb6aa2c3fe3fa7c09d424cd5f744ef95397043652f6b874b47cbddb0b7ce29' 
  AND token = '10KbT5D6MFxrgAQUGJiNxQl1/pt6kpGQmXbJ//hC8wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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