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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3035674874a81d74efca3df2b86390823c01c6ab84e41ad0fe852db2edbb21c7' 
  AND token = 'IISvsqfbkTZ5gLg0yObbiGmOGvA4gmY3/ziFidWFVmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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