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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bf3be227419dd7cc2c3074c9396a21444438ebfeda9742724a2920c7968553' 
  AND token = 'L9ZdN/m9TNTM33iu83Doa4iL3nOsSTAgfVZxQPoXiqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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