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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f9d496a3860755efd1f6a7cb37abb226db9e6e11267c66669d2cb213bb1347' 
  AND token = 'xugjzG3quUsvqitgDz9VOmtYat9uaj5FQOlVIFHcqf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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