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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb71e2f96dbc50437e88734e766533c2b2b1d173fab6b5d0c8999138943b51a' 
  AND token = 'LUXkESw55ZIvaMgsdYD83eJMCo1YUiYxtq7rFUXoW2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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