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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052280a4e17f46d8894b32c5b0183e4265c60b842d05799502a2216e7beee783' 
  AND token = '7VQ6dsAKKBkL5+TMXyI7S/JEkPA0HOrkPndpPGccvWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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