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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b01c10464848c68e708f0eda44e905fe78e4cd06923dd5b64c5bbfa5aa0df7b' 
  AND token = '36nkctsaHHnhrQQ7BHPiMCfz2yvRKGFz+yOOFrU1qV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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