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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d4327a3289d57bc97bfe70e2412d358c0eddb097dd132be6f01a9f452629a8' 
  AND token = '51nhjIs4LuKeNL7uq6+6w57ggJApAdAXms/4lo1mMxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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