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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ac976e48062b75793d4ed308d2186ee741ec303bc357a732699b83cf42f270' 
  AND token = 'tUdm2M4PiRFnaa6PmIhU5cdQ2Fj3WF19iwBzaDS0E7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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