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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f98e125e96281a47fdaa5946a2b7512b1b89af268047547c9cdf237f76846b' 
  AND token = 'rVtXhoJkHovfnvn2j4962zgAfOIQapz50lCvNqm3x70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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