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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c967b197eab7543963b18f91f0ad3ec33ab31cd0a88c1f8934dec96beb6d2b8' 
  AND token = 'bmrjrcjQ1se356gNZa6hyOHNR6Gq4A2WBeBW0fLXT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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