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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b565848900b45525941e299b3eaecdf9f270b81a2e16e41167396b422a094277' 
  AND token = 'u5o7ZtOps5Ul/TK18fNpIf7wJj0J4Gw+F+rwNrwRflg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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