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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d18834f9a1fdb86c985170705be8b85de655d5fd52460d378cc3f35aa3ad6c' 
  AND token = 'IQsEtUnn9LOV9iRF1/w5X2bViwGcRl0mNud5gZUr72M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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