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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadfb4ea784ac4283547d038806637b8320cb9a5baca20d14deedf77d4e50ad5' 
  AND token = 'yWVZHGZUWFBMt4D9afZYzBeF/j5810vpG2YNFGZcYR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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