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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8c1a8fce3f68902752e56e958ec3b744383d0ae706860595788d345e639263' 
  AND token = 'WLWcrVKqMTi1Wys8I6phYNGHSu0VY2oIhwzL0L37MG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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