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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc87d09543d3d905f320cdec333e0d15a7c818261dd1cc302b773cc8b7d35aea' 
  AND token = 'wLytwAIy1FkIEPSFZlihY0yTjVEEQDAIllVY3Igl9QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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