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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208a0def6ae01e0c0e2ed352c4e26dd1c8b794d18b0bb63540e468c5d2966899' 
  AND token = 'FJIyqRNp6tO5n3J8Hmxg1+IK7h5uK0Y5sNhC6cq8gkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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