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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccb239123494cbf9f4a5a0ea1565141ccdac0b0f5b89a9e685325411d8c6ef0' 
  AND token = 'HRg7IEtrOOkQ5YW9iUGeotZmIbRN9wQqAL1y3/RoEtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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