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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b2b602234a079689461507716a5562dfecd758c341edd77e22dc566365aa38' 
  AND token = 'y4Ym+IE6W+0pYCN9uu7f/CaiuMBifsSsfowW07YedM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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